95 results about "Spurious emission" patented technology

A filter device that reduces spurious emissions generated in a frequency band 1.2 to 1.4 times greater than a center frequency of a passband of a filter. In one example the filter device includes a first filter connected between a common contact and a first signal contact and having a first passband, and a second filter connected between the common contact and a second signal contact and having a second passband with a center frequency in a range of 1.2 to 1.4 times greater than a center frequency of the first passband. The first filter includes a SAW filter formed on a piezoelectric substrate, a SAW resonator formed on the piezoelectric substrate and connected in series between the common contact and the SAW filter, and a dielectric film covering the SAW filter and SAW resonator, the dielectric film having a reduced thickness in a region corresponding to the SAW resonator.

A peak to average power ratio signal is generated from a first mapping function that selects the peak to average power ratio signal that corresponds to the data rate or data format of the signal to be transmitted. The selected peak to average power ratio signal is summed with a desired average transmit power signal. The resulting summation signal is input to a second effectively continuously valued mapping function comprising a table that has a plurality of power amplifier control signal values each with a corresponding peak transmit power. Each peak transmit power signal value results in a power amplifier control signal value that achieves the best possible transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirements. The summation signal value maps to one of the power amplifier control signal value that is then used to adjust a parameter such as bias of the power amplifier.

A peak to average power ratio signal is generated from a first mapping function that selects the peak to average power ratio signal that corresponds to the data rate or data format of the signal to be transmitted. The selected peak to average power ratio signal is summed with a desired average transmit power signal. The resulting summation signal is input to a second effectively continuously valued mapping function comprising a table that has a plurality of power amplifier control signal values each with a corresponding peak transmit power. Each peak transmit power signal value results in a power amplifier control signal value that achieves the best possible transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirements. The summation signal value maps to one of the power amplifier control signal value that is then used to adjust a parameter such as bias of the power amplifier.

The invention discloses a spurious emission interference suppressing method, which can be used for suppressing a spurious emission interference signal of an electronic device. The method comprises the following steps: first of all, modulating an amplitude of a baseband signal to obtain a first modulation signal; then, carrying out down-conversion processing on the first modulation signal to obtain a mixed signal comprising the baseband signal and the spurious emission interference signal; after that, filtering the baseband signal in the mixed signal to obtain the spurious emission interference signal; then, carrying out phase reversal processing on the spurious emission interference signal to obtain a phase reversal spurious emission interference signal; then, carrying out up-conversion processing on the phase reversal spurious emission interference signal to obtain a second modulation signal; and at last, combining the second modulation signal and the first modulation signal to enable the spurious emission interference signal to offset the phase reversal spurious emission interference signal. By adopting the spurious emission interference suppressing method or the spurious emission interference suppressing device disclosed by the embodiment of the invention, spurious emission interference elements in the modulation signals can be effectively suppressed, thereby improving the quality of the modulation signals. And the invention further discloses the spurious emission interference suppressing device and the electronic device.

The invention discloses an intelligent repeater and an automatic adjusting method for the parameters thereof. The intelligent repeater station includes a donor antenna, a retransmission antenna, a radio frequency transceiver hardware unit, a power detecting component, a control center and an intelligent control system. The control center includes a base station information monitoring module, an information analyzing module and a communicating module. The intelligent control system includes a monitoring unit and a control unit. The monitoring unit includes a device monitoring module and the communicating module. The control unit includes the information analyzing module and a control module. The invention gathers the information from the base station and the self parameter information of the repeater through the control center and the intelligent control system and carries out analyzing and calculating on the information according to certain arithmetic and automatically adjusts the parameters of the repeater according to the calculating results. Adopting the intelligent station and the automatic adjusting method for the parameters thereof can realize automatic frequency control and adjustment and increases the effectiveness of network coverage as well as realize automatic multi-carrier power control to lead each carrier output power to be stable and improve the quality of network. The invention can automatically control a spurious emission power and prevent the base station from being continuous interrupted.

An acoustic wave device includes a piezoelectric substrate, an interdigital transducer (IDT) electrode provided on an upper surface of the piezoelectric substrate, a first dielectric film covering the upper surface of the piezoelectric substrate to cover the IDT electrode, and a second dielectric film covering an upper surface of the first dielectric film. The second dielectric film includes a thin portion positioned in a tip region of electrode fingers of the IDT electrode and a thick portion which is positioned in a middle region of the IDT electrode and is thicker than the thin portion. The acoustic wave device suppresses spurious emission and has superior passband characteristics.

An acoustic wave resonator includes a piezoelectric body, an IDT electrode for exciting an acoustic wave with wavelength λ, and a dielectric thin film provided so as to cover the IDT electrode. The IDT electrode includes a bus bar electrode region, a dummy electrode region, and an IDT cross region in order from outside. The film thickness of the dielectric thin film above at least one of the bus bar electrode region and the dummy electrode region is smaller than that above the IDT cross region by 0.1λ to 0.25λ. This configuration provides an acoustic wave resonator that reduces transverse-mode spurious emission.

A direct digital synthesizer (DDS) (300) that uses a system for reducing spurious emissions in a digital-to-time converter (DTC) (317). The DDS (300) includes one or more dither sources (307) and a random access memory (RAM) (305). The RAM (305) utilizes a look-up table for storing delay error values by using an output of the look-up table which is combined with the dither source (307) to compensate unequal unit delay values in the DTC (317).

A method for transmitting multiple communications of different types, in particular sporadic (MTC) or cellular (broadband) communication including symbols to be transmitted, corresponding to communication services implementing a modulation having M subcarriers of the FBMC-OQAM or OFDM-OQAM type. The method uses linear frequency filtering of a sequence of length N including symbols having L coefficients that are parametrizable according to the communication, L, N, and M being natural numbers, so as to generate N+L−1 symbols, reducing out-of-band spurious emissions. The method also uses, no matter what the communication is, a single frequency / time transform (IFFT) having a size M, where N<M. For sporadic communications (MTC) in a lower frequency band, the constraints on the out-of-band side-lobes are more stringent on the filter and FBMC modulation is thus better adapted.

A communication device receives a transmitted signal from another communication device. This transmitted signal is generated within the another communication device based on predetermined digital data. The communication device then generates a first reference signal based on a copy of the predetermined digital data and subtracts the first reference signal from the transmitted signal to generate a first residual signal. The communication device then identifies at least one adaptation parameter based on the first residual signal and adapts the first reference signal using the at least one adaptation parameter to generate a second reference signal so that a first characteristic of the transmitted signal and a second characteristic of the second reference signal are approximately equal. The communication device then subtracts the second reference signal from the transmitted signal to generate a second residual signal processes the second residual signal to characterize inband spurious emission within the transmitted signal.

According to one embodiment of the present invention, provided is a wireless equipment for transmitting an uplink signal through a reduced transmission resource block (RB) in a wireless communication system. The wireless equipment can comprise: a processor; and a radio frequency (RF) unit for transmitting an uplink signal under control of the processor. When the RF unit is set to a predetermined channel bandwidth and a predetermined frequency range and must satisfy a predetermined maximum allowed value of spurious radiation to protect another frequency range, the uplink signal can be transmitted according to a predetermined maximum number of RBs instead of a total number of RBs for the predetermined channel bandwidth.